Millstone-dressing machine



(No Model.) 4

G. D. OLMSTEAD. MILLSTON-E DRESSING MACHINE.

No. 244,286.- Patented July 12,1881.

2 SheetsSheet 1.

2 Sheets-Sheet 2.

(no Model.)

G. D. OLM'STEAD.

. MILLSTONE DRESSING MACHINE. N0.'244,Z86.'

i'tnfin Patented July 12, 188-1.

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' NITED STATES PATENT OFFICE.

CHARLES D. OLMSTEAD, on WlLLIAMSPORT, PENNSYLVANIA.

MILLSTONE-DRESSING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 244,286, dated July 12, 1881.

Application filed October 20,1880. (No model.)

To all whom it may concern:

Be it known that I, CHARLES D. OLMSTEAD, of Williamsport, in the county of Lycoming, and in the State of Pennsylvania, haveinvented certain new and useful Improvements in Machines for Dressing Millstones; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to the accompanying drawings,.and to the letters of reference marked thereon, making a part of this specification.

This invention relates to certain improvements in diamond burr-dressing machines and it has for its objects, first, to provide an improved handle or diamond-holder for such machines, and means for holding the diamond in the same; second, to provide an improved means whereby the lateral carriage of such machines may be readily and conveniently returned to normal position without loss of time;

and, third, to provide a means whereby the distance between the cutting strokes may be regulated, in order to make the cut coarse or fine, as may be required, as more fully hereinafter specified. These objects I attain by the mechanism illustrated in the accompanying drawings, in which- Figure 1 represents a top view of my improved machine complete; Fig. 2, a side elevation of the same; Fig. 3, a longitudinal vertical section of a portion of the machine; Fig. 4, a detached view of the tool holder or handle in section; and Fig. 5, a detached top view of the laterally-traveling carriage, showing the mechanism for releasing the same from its leading-screw, to permit it to be returned to its normal position and Fig. 6 represents a detached sectional view of the laterally-traveling carriage.

The letter A indicates the bed of the machine, consisting of a rectangular frame of metal,provided with handles at each end, by means of which it maybe lifted. The said bedis provided with ways B, upon which is adapted to travel the longitudinally-traveling carriage O, which is reciprocated by hand by means of the handle D.

The letter E indicates the laterally-travelin g carriage, adapted to travel transversely across the longitudinally-traveling carriage in the angular ways F.

The handle or tool-holder is provided with a cylindrical shank, G, which is adapted to fit in a cylindrical seat, H, in the laterally-traveling carriage, the lower end of the shank projecting below, so as to permit the diamond to bear upon the stone or burr, the position of the handle being regulated by means of aset-screw, I. The lower end of the shank is constructed in two parts, a I), which are clamped together upon the diamond cby means of a set-screw,d.

The letter K indicates a leading-screw, extending transversely across the longitudinallytraveling carriage, and journaled in boxes L at opposite sides of the same. The said screw is prpvided with ratchet-wheels M N at opposite Sl( es.

The letter 0 indicates a pawl, pivoted at P to a lever, Q, fulcrumed to the longitudinallytraveling carriage, and held in and returned to normal position by the spring S.

The lever Q is provided with a beveled abutment, T, at one end, which is adapted to ride up onto the adjustable inclined bearing U, secured to one end of the bed by means of a set screw, V, passing through a slot in said bearin g, whereby the bearing can be set to or from the traveling carriage, to regulate the throw of the lever and its pawl. The pawl on said lever is adapted to engage the ratchet-wheel M and rotate it to an extent corresponding to the throw given by the inclined bearing and traverse the laterally-traveling carriage to a greater or less extent, thus regulating or varying the width of the strokes of the diamond. The ratchet N is engaged by a pawl, W, pivoted to the lon gitudinally-travelin g carriage, the object of said pawl being to prevent back play of the leading-screw.

The letter A indicates a vertical slide setting in a seat, B ,in the laterally-travelin g carriage, and adapted to play vertically therein. The said slide is provided with a half-circular recess at its lower end, which is adapted to engage the threads of the leading-screw when said slide is down,so as to cause said screw to traverse the carriage transversely.

The letter 0 indicates a lever fulcrumed in a' standard, D, rising from the laterally-travelin g carriage, one end of which is loosely connected to the slide A, and the other provided with a thumb-bearing, by which it may be depressed to elevate the slide and release it from the leading-screw, to permit the carriage to be moved back to its normal position independent of the screw.

E indicates a spring by which the lever O is kept and returned to a normal position.

The operation of my invention is as follows: The machine is placed upon the face of the burr to be dressed, and the longitudinally-traveling carriage is reciprocated back and forth by hand by means of the handle carrying the diamond. At the end of the stroke, when the abutment on the lever rides up onto the inclined bearing, the pawl of said lever will rotate the ratchet, and with it the leading-screw, traversing the laterally traveling carriage transversely step by step. When the carriage has traveled to its limit the thumb-bearing of the lever is depressed, elevating the slide A, permitting the laterally-slidin g carriage to be pushed back to its normal position.

I am aware that millstone-dressers have been heretofore constructed with longitudinally and transversely traveling carriages and mechanism for driving the transverse carriage laterally also, thata handle carryingthe cuttingtool has been employed in connection with such carriages, and such I do not seek to claim, broadly.

Having thus described myinvention, what I claim, and desire to secure by Letters Patent, is

In combination with the bed A, provided with ways B,the longitudinally-traveling carriage O and laterally-traveling carriage E, the latter carrying a detachable handle, D, provided with a cutting-tool, the leading-screw K, provided with ratchet-wheels M N at opposite ends, and their pawls, the lever Q, provided with abutment '1, and the adjustable cam V, the whole adapted to operate substantially in the manner specified.

In testimony that I claim the foregoing I have hereunto set my hand this 11th day of October, 1880.

CHARLES D. OLMSTEAD.

Witnesses:

HENRY W. WATSON, JOSIAH HOWARD. 

